Writing instrument



FIG. 1 is a perspective view of a writing instrument showing our new design;

FIG. 2 is a front view of the same;

FIG. 3 is a back view of the same;

FIG. 4 is a right side view of the same, the left side view being a mirror image of the right side view;

FIG. 5 is a top view of the same; and,

FIG. 6 is a bottom view of the same.

Portions of the writing instrument shown in broken lines are for illustrative purposes only, and form no part of the claimed design. 

We claim the ornamental design for a writing instrument, as shown and described. 